it doesnt stand for anything its not an abbreviation its a latin prefix that is a bastardized word to denote normal aka non trans mentally ill people its also an indicator to tell you if anything that a person has to say has any value i know that if i see or hear someone use cis in a non ironic fashion then theyre a degenerate liberal tranny enabler and nothing they ever have to say will be of any interest and i can completely discount their opinion on any subject